Answer: They are the same nine months, only they can be either shortened to seven or increased to 12. In our world as well, babies are born in the seventh month, eighth month, and even earlier.
And if the fetus is overdue, this is also bad. This can lead to very bad consequences. In this case, the acceleration of fetal development and uterine contractions are prompted, and the fetus is pushed out. As if the host throws the guest out of his house.
Comment: In Hebrew, month is called Hodesh—from the word “Hidush” (renewal).
My Response: After seven months, corresponding to the seven Sefirot (Hesed, Gevura, Tifferet, Netzach, Hod, Yesod, and Malchut), the embryo practically finishes its main development. But there are two additional months that are higher than Hesed, Bina and Hochma, which complete the nine months.
The fetus is completely closed at that point, and what remains is only for it to leave the mother and start to develop.
Question: And where do the 12 months come from then?
Answer: There are such special conditions when there is even 12 months of intrauterine development. This is described in the Talmud but as an unusual phenomenon.
From KabTV’s “Spiritual States” 8/6/21